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  • 1.
    Blomdahl, Markus
    RISE, Swerea, SWECAST.
    Rekommendationer för skruvförband med pressgjutgods2005Report (Other academic)
  • 2.
    Diószegi, A.
    et al.
    Jönköping University, Sweden.
    Diaconu, V. -L
    Jönköping University, Sweden.
    Fourlakidis, Vasilios
    RISE, Swerea, SWECAST.
    Prediction of volume fraction of primary austenite at solidification of lamellar graphite cast iron using thermal analyses2016In: Journal of thermal analysis and calorimetry (Print), ISSN 1388-6150, E-ISSN 1588-2926, Vol. 124, no 1, p. 215-225Article in journal (Refereed)
    Abstract [en]

    Lamellar graphite cast iron was investigated with carbon equivalents varied between CE = 3.4 and 4.26, cast at various cooling rates between 0.195 and 3.5 °C s-1 covering the limits used for technical applications in the production of complex-shaped lamellar graphite cast iron. Registered cooling curves displaced in two positions in the casting were used to predict the solidification and microstructure formation mechanisms. The predicted volume fraction of primary austenite was compared with the fraction of primary austenite measured on colour micrographs with the help of image analyses. A good correlation has been obtained for medium and slow cooling conditions, while a less good correlation at fast cooling condition was attributed to the used protective environment to preserve thermocouples. The observed fraction and the predicted fraction of primary austenite were in good correlation and followed a consequent variation dependent on the carbon equivalent. Furthermore, the quality of the prediction was dependent on the used numerical algorithm involving cooling information from either one or two thermocouples.

  • 3.
    Diószegi, A.
    et al.
    Jönköping University, Sweden.
    Fourlakidis, Vasilios
    RISE, Swerea, SWECAST.
    Lora, R.
    Jönköping University, Sweden.
    Austenite dendrite morphology in lamellar graphite iron2015In: International Journal of Cast Metals Research, ISSN 1364-0461, E-ISSN 1743-1336, Vol. 28, no 5, p. 310-317Article in journal (Refereed)
    Abstract [en]

    Primary austenite has been underestimated in general when the theories of nucleation, solidification, microstructure formation and mechanical properties were established for cast iron and particularly for lamellar cast iron. The present work aims to investigate the primary austenite morphology of as cast samples of a hypoeutectic lamellar cast iron produced with different cooling rates. Morphological parameters as the area fraction primary austenite, the secondary dendrite arm spacing, the dendrite envelope surface, the coarseness of the primary dendrite expressed as the relation between the volume of the dendrite and its envelope surface and the coarseness of the interdendritic space also known as the hydraulic diameter are measured. Furthermore, the role of the size of the investigation area is revealed to be sequential investigation. A strong relation between all measured morphological parameters and the solidification time has been established, except the volume fraction of primary austenite, which is constant for all cooling conditions. 

  • 4.
    Fourlakidis, Vasilios
    RISE, Swerea, SWECAST.
    A study on ductile iron production without the use of feeders2013In: Foundry Trade Journal International, ISSN 1758-9789, Vol. 187, no 3702, p. 60-62Article in journal (Refereed)
    Abstract [en]

    This paper investigates the effects of graphite added as a conditioner, of lanthanum containing nodulariser and of pouring temperature on the formation of shrinkage porosity in ductile iron casting with a eutectic composition. In this experiment for each heat the cooling curves were recorded by the use of Quick-Cups (thermal analysis cups) and different solidification parameters such as TElow, GRF1, GRF2 and TS were calculated and compared with the porosity which was found from the microstructure examination. The results show that there is a good correlation between the amount of the shrinkage formation and the thermal analysis values. Also this experiment confirms that by using certain treating elements and pouring temperature which was between 1340-1350°C it is possible to eliminate the shrinkage defects in ductile iron castings without using feeders.

  • 5.
    Ghasemi, R.
    et al.
    Jönköping University, Sweden.
    Elmquist, L.
    Jönköping University, Sweden.
    Svensson, H.
    RISE, Swerea, SWECAST.
    König, M.
    Scania AB, Sweden.
    Jarfors, A. E. W.
    Jönköping University, Sweden.
    Mechanical properties of Solid Solution-Strengthened CGI2016In: International Journal of Cast Metals Research, ISSN 1364-0461, E-ISSN 1743-1336, Vol. 29, no 1-2, p. 98-105Article in journal (Refereed)
    Abstract [en]

    Despite the increased usage of pearlitic compacted graphite iron (CGI) in heavy vehicle engines, poor machinability of this material remains as one of the main technical challenges as compared to conventional lamellar iron. To minimise the machining cost, it is believed that solution-strengthened CGI material with a ferritic matrix could bring an advantage. The present study focuses on the effect of solution strengthening of silicon and section thickness on tensile, microstructure and hardness properties of high-Si CGI materials. To do so, plates with thicknesses from 7 to 75 mm were cast with three different target silicon levels 3.7, 4.0 and 4.5 wt%. For all Si levels, the microstructure was ferritic with a very limited pearlite content. The highest nodularity was observed in 7 and 15 mm plate sections, respectively, however, it decreased as the plate thickness increased. Moreover, increasing Si content to 4.5 wt% resulted in substantial improvement up to 65 and 50% in proof stress and tensile strength, respectively, as compared to pearlitic CGI. However, adding up Si content to such a high level remarkably deteriorated elongation to failure. For each Si level, results showed that the Young’s modulus and tensile strength are fairly independent of the plate thickness (30–75 mm), however, a significant increase was observed for thin section plates, particularly 7 mm plate due to the higher nodularity in these sections. 

  • 6.
    Nylander, Maria
    RISE, Swerea, SWECAST.
    Processutveckling vid tillverkning av spolkropp ”CHRONO”2008Report (Other academic)
  • 7.
    Siafakas, D.
    et al.
    Jönköping University, Sweden.
    Matsushita, T.
    Jönköping University, Sweden.
    Lauenstein, Åke
    RISE, Swerea, SWECAST.
    Ekerot, S.
    Comdicast AB, Sweden.
    Jarfors, A. E. W.
    Jönköping University, Sweden.
    Particles Precipitation in Ti- and Al-Deoxidized Hadfield Steels2016In: Steel Research International, ISSN 1611-3683, E-ISSN 1869-344X, Vol. 87, no 10, p. 1344-1355Article in journal (Refereed)
    Abstract [en]

    The characteristics and precipitation mechanism of particles in titanium- and aluminum-treated Hadfield steel casted during pilot-scale experiments have been studied. Light Optical Microscopy (LOM), Scanning Electron Microscopy (SEM), and Energy Dispersive X-ray Spectroscopy (EDS) are utilized for the particle analysis and characterization. Additionally, thermodynamic equilibrium calculations are performed using Thermo-Calc software. Aluminum oxides, titanium carbon nitrides, titanium carbides, and manganese sulfides are the main types of particles found. The order of precipitation during solidification and chemical composition range of each type of particle are determined. Aluminum oxides are found to act as nucleation sites for titanium carbon nitrides. Thermodynamic equilibrium calculations for particles characteristics are in good agreement with the experimental findings. Titanium carbides are found to form during initial stages of the ferro-titanium additions dissolution.

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